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openwrt/target/linux/omap24xx/patches-2.6.37/900-n810-battery-management...

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---
arch/arm/mach-omap2/board-n8x0.c | 13 +
drivers/cbus/Kconfig | 12 +
drivers/cbus/Makefile | 3
drivers/cbus/lipocharge.c | 63 ++++++
drivers/cbus/lipocharge.h | 50 ++++
drivers/cbus/n810bm_main.c | 397 +++++++++++++++++++++++++++++++++++++++
drivers/cbus/retu.c | 4
drivers/cbus/retu.h | 3
drivers/cbus/tahvo.h | 6
9 files changed, 548 insertions(+), 3 deletions(-)
Index: linux-2.6.37/drivers/cbus/Kconfig
===================================================================
--- linux-2.6.37.orig/drivers/cbus/Kconfig 2011-02-06 14:05:49.838388760 +0100
+++ linux-2.6.37/drivers/cbus/Kconfig 2011-02-06 14:05:49.885395646 +0100
@@ -94,4 +94,12 @@
to Retu/Vilma. Detection state and events are exposed through
sysfs.
+config N810BM
+ depends on CBUS_RETU && CBUS_TAHVO
+ tristate "Nokia n810 battery management"
+ ---help---
+ Nokia n810 device battery management.
+
+ If unsure, say N.
+
endmenu
Index: linux-2.6.37/drivers/cbus/Makefile
===================================================================
--- linux-2.6.37.orig/drivers/cbus/Makefile 2011-02-06 14:05:49.829387442 +0100
+++ linux-2.6.37/drivers/cbus/Makefile 2011-02-06 14:05:49.885395646 +0100
@@ -12,3 +12,6 @@
obj-$(CONFIG_CBUS_TAHVO_USER) += tahvo-user.o
obj-$(CONFIG_CBUS_RETU_USER) += retu-user.o
obj-$(CONFIG_CBUS_RETU_HEADSET) += retu-headset.o
+n810bm-y += n810bm_main.o
+n810bm-y += lipocharge.o
+obj-$(CONFIG_N810BM) += n810bm.o
Index: linux-2.6.37/drivers/cbus/n810bm_main.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/n810bm_main.c 2011-02-09 19:05:18.435536304 +0100
@@ -0,0 +1,1168 @@
+/*
+ * Nokia n810 battery management
+ *
+ * WARNING: This driver is based on unconfirmed documentation.
+ * It is possibly dangerous to use this software.
+ * Use this software at your own risk!
+ *
+ * Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define DEBUG
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/timer.h>
+#include <linux/firmware.h>
+#include <linux/bitops.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+
+#include "cbus.h"
+#include "retu.h"
+#include "tahvo.h"
+#include "lipocharge.h"
+
+
+#define N810BM_PMM_BLOCK_FILENAME "n810-cal-bme-pmm.fw"
+#define N810BM_PMM_BLOCK_SIZE 0x600
+
+#define N810BM_CHECK_INTERVAL (HZ * 2)
+#define N810BM_MIN_VOLTAGE_THRES 3200 /* Absolute minimum voltage threshold */
+
+
+/* RETU_ADC_BSI
+ * The battery size indicator ADC measures the resistance between
+ * the battery BSI pin and ground. This is used to detect the battery
+ * capacity, as the BSI resistor is related to capacity.
+ *
+ * Manually measured lookup table.
+ * Hard to measure, thus not very accurate.
+ *
+ * Resistance | ADC value
+ * ========================
+ * 120k | 0x3AC
+ * 110k | 0x37C
+ * 100k | 0x351
+ * 90k | 0x329
+ */
+
+/* RETU_ADC_BATTVOLT
+ * Manually measured lookup table.
+ * Hard to measure, thus not very accurate.
+ *
+ * Voltage | ADC value
+ * =====================
+ * 2.80V | 0x037
+ * 2.90V | 0x05E
+ * 3.00V | 0x090
+ * 3.10V | 0x0A4
+ * 3.20V | 0x0CC
+ * 3.30V | 0x0EF
+ * 3.40V | 0x115
+ * 3.50V | 0x136
+ * 3.60V | 0x15C
+ * 3.70V | 0x187
+ * 3.80V | 0x1A5
+ * 3.90V | 0x1C9
+ * 4.00V | 0x1ED
+ * 4.10V | 0x212
+ * 4.20V | 0x236
+ */
+
+
+enum n810bm_capacity {
+ N810BM_CAP_UNKNOWN = -1,
+ N810BM_CAP_NONE = 0,
+ N810BM_CAP_1500MAH = 1500, /* 1500 mAh battery */
+};
+
+enum n810bm_notify_flags {
+ N810BM_NOTIFY_battery_charging,
+ N810BM_NOTIFY_charger_pwm,
+};
+
+struct n810bm {
+ bool battery_present; /* A battery is inserted */
+ bool charger_present; /* The charger is connected */
+ enum n810bm_capacity capacity; /* The capacity of the inserted battery (if any) */
+
+ bool charger_enabled; /* Want to charge? */
+ struct lipocharge charger; /* Charger subsystem */
+ unsigned int active_current_pwm; /* Active value of TAHVO_REG_CHGCURR */
+ int current_measure_enabled; /* Current measure enable refcount */
+
+ struct platform_device *pdev;
+ const struct firmware *pmm_block; /* CAL PMM block */
+
+ bool verbose_charge_log; /* Verbose charge logging */
+
+ unsigned long notify_flags;
+ struct work_struct notify_work;
+ struct work_struct currmeas_irq_work;
+ struct delayed_work periodic_check_work;
+
+ bool initialized; /* The hardware was initialized */
+ struct mutex mutex;
+};
+
+static void n810bm_notify_battery_charging(struct n810bm *bm);
+static void n810bm_notify_charger_pwm(struct n810bm *bm);
+
+
+static inline struct n810bm * device_to_n810bm(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct n810bm *bm = platform_get_drvdata(pdev);
+
+ return bm;
+}
+
+static inline bool n810bm_known_battery_present(struct n810bm *bm)
+{
+ return bm->battery_present &&
+ bm->capacity != N810BM_CAP_UNKNOWN &&
+ bm->capacity != N810BM_CAP_NONE;
+}
+
+static NORET_TYPE void n810bm_emergency(struct n810bm *bm, const char *message) ATTRIB_NORET;
+static void n810bm_emergency(struct n810bm *bm, const char *message)
+{
+ printk(KERN_EMERG "n810 battery management fatal fault: %s\n", message);
+ cbus_emergency();
+}
+
+static u16 tahvo_read(struct n810bm *bm, unsigned int reg)
+{
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tahvo_lock, flags);
+ ret = tahvo_read_reg(reg);
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+ if (ret < 0 || ret > 0xFFFF)
+ n810bm_emergency(bm, "tahvo_read");
+
+ return ret;
+}
+
+static void tahvo_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
+{
+ int ret;
+ unsigned long flags;
+ u16 value;
+
+ spin_lock_irqsave(&tahvo_lock, flags);
+ if (~mask) {
+ ret = tahvo_read_reg(reg);
+ if (ret < 0 || ret > 0xFFFF)
+ goto fatal_unlock;
+ value = ret;
+ } else
+ value = 0;
+ value &= ~mask;
+ value |= set;
+ ret = tahvo_write_reg(reg, value);
+ if (ret)
+ goto fatal_unlock;
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+
+ return;
+
+fatal_unlock:
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+ n810bm_emergency(bm, "tahvo_maskset");
+}
+
+static inline void tahvo_write(struct n810bm *bm, unsigned int reg, u16 value)
+{
+ tahvo_maskset(bm, reg, 0xFFFF, value);
+}
+
+static inline void tahvo_set(struct n810bm *bm, unsigned int reg, u16 mask)
+{
+ tahvo_maskset(bm, reg, mask, mask);
+}
+
+static inline void tahvo_clear(struct n810bm *bm, unsigned int reg, u16 mask)
+{
+ tahvo_maskset(bm, reg, mask, 0);
+}
+
+static u16 retu_read(struct n810bm *bm, unsigned int reg)
+{
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&retu_lock, flags);
+ ret = retu_read_reg(reg);
+ spin_unlock_irqrestore(&retu_lock, flags);
+ if (ret < 0 || ret > 0xFFFF)
+ n810bm_emergency(bm, "retu_read");
+
+ return ret;
+}
+
+static void retu_maskset(struct n810bm *bm, unsigned int reg, u16 mask, u16 set)
+{
+ int ret;
+ unsigned long flags;
+ u16 value;
+
+ spin_lock_irqsave(&retu_lock, flags);
+ if (~mask) {
+ ret = retu_read_reg(reg);
+ if (ret < 0 || ret > 0xFFFF)
+ goto fatal_unlock;
+ value = ret;
+ } else
+ value = 0;
+ value &= ~mask;
+ value |= set;
+ ret = retu_write_reg(reg, value);
+ if (ret)
+ goto fatal_unlock;
+ spin_unlock_irqrestore(&retu_lock, flags);
+
+ return;
+
+fatal_unlock:
+ spin_unlock_irqrestore(&retu_lock, flags);
+ n810bm_emergency(bm, "retu_maskset");
+}
+
+static inline void retu_write(struct n810bm *bm, unsigned int reg, u16 value)
+{
+ retu_maskset(bm, reg, 0xFFFF, value);
+}
+
+static int retu_adc_average(struct n810bm *bm, unsigned int chan,
+ unsigned int nr_passes)
+{
+ unsigned int i, value = 0;
+ int ret;
+
+ if (WARN_ON(!nr_passes))
+ return 0;
+ for (i = 0; i < nr_passes; i++) {
+ ret = retu_read_adc(chan);
+ if (ret < 0)
+ return ret;
+ value += ret;
+ }
+ value /= nr_passes;
+
+ return value;
+}
+
+/* Set the current measure timer that triggers on Tahvo IRQ 7
+ * An interval of zero disables the timer. */
+static void n810bm_set_current_measure_timer(struct n810bm *bm,
+ u16 millisec_interval)
+{
+ u16 value = millisec_interval;
+
+ if (value <= 0xF905) {
+ value = ((u64)0x10624DD3 * (u64)(value + 0xF9)) >> 32;
+ value /= 16;
+ } else
+ value = 0xFF;
+
+ tahvo_write(bm, TAHVO_REG_BATCURRTIMER, value & 0xFF);
+
+ tahvo_set(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_CURTIMRST);
+ tahvo_clear(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_CURTIMRST);
+
+ if (millisec_interval)
+ tahvo_enable_irq(TAHVO_INT_BATCURR);
+ else
+ tahvo_disable_irq(TAHVO_INT_BATCURR);
+
+ //TODO also do a software timer for safety.
+}
+
+static void n810bm_enable_current_measure(struct n810bm *bm)
+{
+ WARN_ON(bm->current_measure_enabled < 0);
+ if (!bm->current_measure_enabled) {
+ /* Enable the current measurement circuitry */
+ tahvo_set(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_CURMEAS);
+ dev_dbg(&bm->pdev->dev,
+ "Current measurement circuitry enabled");
+ }
+ bm->current_measure_enabled++;
+}
+
+static void n810bm_disable_current_measure(struct n810bm *bm)
+{
+ bm->current_measure_enabled--;
+ WARN_ON(bm->current_measure_enabled < 0);
+ if (!bm->current_measure_enabled) {
+ /* Disable the current measurement circuitry */
+ tahvo_clear(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_CURMEAS);
+ dev_dbg(&bm->pdev->dev,
+ "Current measurement circuitry disabled");
+ }
+}
+
+/* Measure the actual battery current. Returns a signed value in mA.
+ * Does only work, if current measurement was enabled. */
+static int n810bm_measure_batt_current(struct n810bm *bm)
+{
+ u16 retval;
+ int adc = 0, ma, i;
+
+ if (WARN_ON(bm->current_measure_enabled <= 0))
+ return 0;
+ for (i = 0; i < 3; i++) {
+ retval = tahvo_read(bm, TAHVO_REG_BATCURR);
+ adc += (s16)retval; /* Value is signed */
+ }
+ adc /= 3;
+
+ //TODO convert to mA
+ ma = adc;
+
+ return ma;
+}
+
+/* Requires bm->mutex locked */
+static int n810bm_measure_batt_current_async(struct n810bm *bm)
+{
+ int ma;
+ bool charging = lipocharge_is_charging(&bm->charger);
+
+ n810bm_enable_current_measure(bm);
+ if (!charging)
+ WARN_ON(bm->active_current_pwm != 0);
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_EN |
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ TAHVO_REG_CHGCTL_EN |
+ TAHVO_REG_CHGCTL_PWMOVR |
+ (charging ? 0 : TAHVO_REG_CHGCTL_PWMOVRZERO));
+ ma = n810bm_measure_batt_current(bm);
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_EN |
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ (charging ? TAHVO_REG_CHGCTL_EN : 0));
+ n810bm_disable_current_measure(bm);
+
+ return ma;
+}
+
+static int adc_sanity_check(struct n810bm *bm, unsigned int channel)
+{
+ int value;
+
+ value = retu_read_adc(channel);
+ if (value < 0) {
+ dev_err(&bm->pdev->dev, "Failed to read GND ADC channel %u",
+ channel);
+ return -EIO;
+ }
+ dev_dbg(&bm->pdev->dev,
+ "GND ADC channel %u sanity check got value: %d",
+ channel, value);
+ if (value > 5) {
+ n810bm_emergency(bm, "GND ADC sanity check failed");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int n810bm_check_adc_sanity(struct n810bm *bm)
+{
+ int err;
+
+ /* Discard one conversion */
+ retu_write(bm, RETU_REG_ADCSCR, 0);
+ retu_read_adc(RETU_ADC_GND2);
+
+ err = adc_sanity_check(bm, RETU_ADC_GND2);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+/* Measure the battery voltage. Returns the value in mV (or negative value on error). */
+static int n810bm_measure_batt_voltage(struct n810bm *bm)
+{
+ int adc;
+ unsigned int mv;
+ const unsigned int scale = 1000;
+
+ adc = retu_adc_average(bm, RETU_ADC_BATTVOLT, 5);
+ if (adc < 0)
+ return adc;
+ if (adc <= 0x37)
+ return 2800;
+ mv = 2800 + ((adc - 0x37) * (((4200 - 2800) * scale) / (0x236 - 0x37))) / scale;
+
+ //TODO compensate for power consumption
+ //TODO honor calibration values
+
+ return mv;
+}
+
+/* Measure the charger voltage. Returns the value in mV (or negative value on error). */
+static int n810bm_measure_charger_voltage(struct n810bm *bm)
+{
+ int adc;
+ unsigned int mv;
+
+ adc = retu_adc_average(bm, RETU_ADC_CHGVOLT, 5);
+ if (adc < 0)
+ return adc;
+ //TODO convert to mV
+ mv = adc;
+
+ return mv;
+}
+
+/* Measure backup battery voltage. Returns the value in mV (or negative value on error). */
+static int n810bm_measure_backup_batt_voltage(struct n810bm *bm)
+{
+ int adc;
+ unsigned int mv;
+
+ adc = retu_adc_average(bm, RETU_ADC_BKUPVOLT, 3);
+ if (adc < 0)
+ return adc;
+ //TODO convert to mV
+ mv = adc;
+
+ return mv;
+}
+
+/* Measure the battery temperature. Returns the value in K (or negative value on error). */
+static int n810bm_measure_batt_temp(struct n810bm *bm)
+{
+ int adc;
+ unsigned int k;
+
+ adc = retu_adc_average(bm, RETU_ADC_BATTEMP, 3);
+ if (adc < 0)
+ return adc;
+ //TODO convert to K
+ k = adc;
+
+ return k;
+}
+
+/* Read the battery capacity via BSI pin. */
+static enum n810bm_capacity n810bm_read_batt_capacity(struct n810bm *bm)
+{
+ int adc;
+ const unsigned int hyst = 20;
+
+ adc = retu_adc_average(bm, RETU_ADC_BSI, 5);
+ if (adc < 0) {
+ dev_err(&bm->pdev->dev, "Failed to read BSI ADC");
+ return N810BM_CAP_UNKNOWN;
+ }
+
+ if (adc >= 0x3B5 - hyst && adc <= 0x3B5 + hyst)
+ return N810BM_CAP_1500MAH;
+
+ dev_err(&bm->pdev->dev, "Capacity indicator 0x%X unknown", adc);
+
+ return N810BM_CAP_UNKNOWN;
+}
+
+/* Convert a battery voltage (in mV) to percentage. */
+static unsigned int n810bm_mvolt2percent(unsigned int mv)
+{
+ const unsigned int minv = 3700;
+ const unsigned int maxv = 4150;
+ unsigned int percent;
+
+ mv = clamp(mv, minv, maxv);
+ percent = (mv - minv) * 100 / (maxv - minv);
+
+ return percent;
+}
+
+static void n810bm_start_charge(struct n810bm *bm)
+{
+ int err;
+
+ WARN_ON(!bm->battery_present);
+ WARN_ON(!bm->charger_present);
+
+ /* Set PWM to zero */
+ bm->active_current_pwm = 0;
+ tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
+
+ /* Charge global enable */
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_EN |
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ TAHVO_REG_CHGCTL_EN);
+
+ WARN_ON((int)bm->capacity <= 0);
+ bm->charger.capacity = bm->capacity;
+ err = lipocharge_start(&bm->charger);
+ WARN_ON(err);
+
+ /* Initialize current measurement circuitry */
+ n810bm_enable_current_measure(bm);
+ n810bm_set_current_measure_timer(bm, 250);
+
+ dev_info(&bm->pdev->dev, "Charging battery");
+ n810bm_notify_charger_pwm(bm);
+ n810bm_notify_battery_charging(bm);
+}
+
+static void n810bm_stop_charge(struct n810bm *bm)
+{
+ if (lipocharge_is_charging(&bm->charger)) {
+ n810bm_set_current_measure_timer(bm, 0);
+ n810bm_disable_current_measure(bm);
+ }
+ lipocharge_stop(&bm->charger);
+
+ /* Set PWM to zero */
+ bm->active_current_pwm = 0;
+ tahvo_write(bm, TAHVO_REG_CHGCURR, bm->active_current_pwm);
+
+ /* Charge global disable */
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_EN |
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ 0);
+
+ dev_info(&bm->pdev->dev, "Not charging battery");
+ n810bm_notify_charger_pwm(bm);
+ n810bm_notify_battery_charging(bm);
+}
+
+/* Periodic check */
+static void n810bm_periodic_check_work(struct work_struct *work)
+{
+ struct n810bm *bm = container_of(to_delayed_work(work),
+ struct n810bm, periodic_check_work);
+ u16 status;
+ bool battery_was_present, charger_was_present;
+ int mv;
+
+ mutex_lock(&bm->mutex);
+
+ status = retu_read(bm, RETU_REG_STATUS);
+ battery_was_present = bm->battery_present;
+ charger_was_present = bm->charger_present;
+ bm->battery_present = !!(status & RETU_REG_STATUS_BATAVAIL);
+ bm->charger_present = !!(status & RETU_REG_STATUS_CHGPLUG);
+
+ if (bm->battery_present != battery_was_present) {
+ /* Battery state changed */
+ if (bm->battery_present) {
+ bm->capacity = n810bm_read_batt_capacity(bm);
+ if (bm->capacity == N810BM_CAP_UNKNOWN) {
+ dev_err(&bm->pdev->dev, "Unknown battery detected");
+ } else {
+ dev_info(&bm->pdev->dev, "Detected %u mAh battery",
+ (unsigned int)bm->capacity);
+ }
+ } else {
+ bm->capacity = N810BM_CAP_NONE;
+ dev_info(&bm->pdev->dev, "The main battery was removed");
+ //TODO disable charging
+ }
+ }
+
+ if (bm->charger_present != charger_was_present) {
+ /* Charger state changed */
+ dev_info(&bm->pdev->dev, "The charger was %s",
+ bm->charger_present ? "plugged in" : "removed");
+ }
+
+ if ((bm->battery_present && !bm->charger_present) ||
+ !n810bm_known_battery_present(bm)){
+ /* We're draining the battery */
+ mv = n810bm_measure_batt_voltage(bm);
+ if (mv < 0) {
+ n810bm_emergency(bm,
+ "check: Failed to measure voltage");
+ }
+ if (mv < N810BM_MIN_VOLTAGE_THRES) {
+ n810bm_emergency(bm,
+ "check: Minimum voltage threshold reached");
+ }
+ }
+
+ if (bm->charger_present && n810bm_known_battery_present(bm)) {
+ /* Known battery and charger are connected */
+ if (bm->charger_enabled) {
+ /* Charger is enabled */
+ if (!lipocharge_is_charging(&bm->charger)) {
+ //TODO start charging, if battery is below some threshold
+ n810bm_start_charge(bm);
+ }
+ }
+ }
+
+ if (lipocharge_is_charging(&bm->charger) && !bm->charger_present) {
+ /* Charger was unplugged. */
+ n810bm_stop_charge(bm);
+ }
+
+ mutex_unlock(&bm->mutex);
+ schedule_delayed_work(&bm->periodic_check_work,
+ round_jiffies_relative(N810BM_CHECK_INTERVAL));
+}
+
+static void n810bm_adc_irq_handler(unsigned long data)
+{
+ struct n810bm *bm = (struct n810bm *)data;
+
+ retu_ack_irq(RETU_INT_ADCS);
+ //TODO
+dev_info(&bm->pdev->dev, "ADC interrupt triggered\n");
+}
+
+static void n810bm_tahvo_current_measure_work(struct work_struct *work)
+{
+ struct n810bm *bm = container_of(work, struct n810bm, currmeas_irq_work);
+ int res, ma, mv, temp;
+
+ mutex_lock(&bm->mutex);
+ if (!lipocharge_is_charging(&bm->charger))
+ goto out_unlock;
+
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ TAHVO_REG_CHGCTL_PWMOVR);
+ ma = n810bm_measure_batt_current(bm);
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO);
+ msleep(10);
+ mv = n810bm_measure_batt_voltage(bm);
+ tahvo_maskset(bm, TAHVO_REG_CHGCTL,
+ TAHVO_REG_CHGCTL_PWMOVR |
+ TAHVO_REG_CHGCTL_PWMOVRZERO,
+ 0);
+ temp = n810bm_measure_batt_temp(bm);
+ if (WARN_ON(mv < 0))
+ goto out_unlock;
+ if (WARN_ON(temp < 0))
+ goto out_unlock;
+
+ if (bm->verbose_charge_log) {
+ dev_info(&bm->pdev->dev,
+ "Battery charge state: %d mV, %d mA (%s)",
+ mv, ma,
+ (ma <= 0) ? "discharging" : "charging");
+ }
+ res = lipocharge_update_state(&bm->charger, mv, ma, temp);
+ if (res) {
+ if (res > 0)
+ dev_info(&bm->pdev->dev, "Battery fully charged");
+ n810bm_stop_charge(bm);
+ }
+out_unlock:
+ mutex_unlock(&bm->mutex);
+}
+
+static void n810bm_tahvo_current_measure_irq_handler(unsigned long data)
+{
+ struct n810bm *bm = (struct n810bm *)data;
+
+ tahvo_ack_irq(TAHVO_INT_BATCURR);
+ schedule_work(&bm->currmeas_irq_work);
+}
+
+#define DEFINE_ATTR_NOTIFY(attr_name) \
+ void n810bm_notify_##attr_name(struct n810bm *bm) \
+ { \
+ set_bit(N810BM_NOTIFY_##attr_name, &bm->notify_flags); \
+ wmb(); \
+ schedule_work(&bm->notify_work); \
+ }
+
+#define DEFINE_SHOW_INT_FUNC(name, member) \
+ static ssize_t n810bm_attr_##name##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+ { \
+ struct n810bm *bm = device_to_n810bm(dev); \
+ ssize_t count; \
+ \
+ mutex_lock(&bm->mutex); \
+ count = snprintf(buf, PAGE_SIZE, "%d\n", (int)(bm->member)); \
+ mutex_unlock(&bm->mutex); \
+ \
+ return count; \
+ }
+
+#define DEFINE_STORE_INT_FUNC(name, member) \
+ static ssize_t n810bm_attr_##name##_store(struct device *dev, \
+ struct device_attribute *attr,\
+ const char *buf, size_t count)\
+ { \
+ struct n810bm *bm = device_to_n810bm(dev); \
+ long val; \
+ int err; \
+ \
+ mutex_lock(&bm->mutex); \
+ err = strict_strtol(buf, 0, &val); \
+ if (!err) \
+ bm->member = (typeof(bm->member))val; \
+ mutex_unlock(&bm->mutex); \
+ \
+ return err ? err : count; \
+ }
+
+#define DEFINE_ATTR_SHOW_INT(name, member) \
+ DEFINE_SHOW_INT_FUNC(name, member) \
+ static DEVICE_ATTR(name, S_IRUGO, \
+ n810bm_attr_##name##_show, NULL);
+
+#define DEFINE_ATTR_SHOW_STORE_INT(name, member) \
+ DEFINE_SHOW_INT_FUNC(name, member) \
+ DEFINE_STORE_INT_FUNC(name, member) \
+ static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, \
+ n810bm_attr_##name##_show, \
+ n810bm_attr_##name##_store);
+
+DEFINE_ATTR_SHOW_INT(battery_present, battery_present);
+DEFINE_ATTR_SHOW_INT(charger_present, charger_present);
+DEFINE_ATTR_SHOW_INT(charger_pwm, active_current_pwm);
+static DEFINE_ATTR_NOTIFY(charger_pwm);
+DEFINE_ATTR_SHOW_STORE_INT(charger_enable, charger_enabled);
+DEFINE_ATTR_SHOW_STORE_INT(charger_verbose, verbose_charge_log);
+
+static ssize_t n810bm_attr_battery_charging(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count;
+
+ mutex_lock(&bm->mutex);
+ count = snprintf(buf, PAGE_SIZE, "%d\n",
+ (int)lipocharge_is_charging(&bm->charger));
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(battery_charging, S_IRUGO,
+ n810bm_attr_battery_charging, NULL);
+static DEFINE_ATTR_NOTIFY(battery_charging);
+
+static ssize_t n810bm_attr_battery_level_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count = -ENODEV;
+ int millivolt;
+
+ mutex_lock(&bm->mutex);
+ if (!bm->battery_present || lipocharge_is_charging(&bm->charger))
+ millivolt = 0;
+ else
+ millivolt = n810bm_measure_batt_voltage(bm);
+ if (millivolt >= 0) {
+ count = snprintf(buf, PAGE_SIZE, "%u\n",
+ n810bm_mvolt2percent(millivolt));
+ }
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(battery_level, S_IRUGO,
+ n810bm_attr_battery_level_show, NULL);
+
+static ssize_t n810bm_attr_battery_capacity_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count;
+ int capacity = 0;
+
+ mutex_lock(&bm->mutex);
+ if (n810bm_known_battery_present(bm))
+ capacity = (int)bm->capacity;
+ count = snprintf(buf, PAGE_SIZE, "%d\n", capacity);
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(battery_capacity, S_IRUGO,
+ n810bm_attr_battery_capacity_show, NULL);
+
+static ssize_t n810bm_attr_battery_temp_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count = -ENODEV;
+ int k;
+
+ mutex_lock(&bm->mutex);
+ k = n810bm_measure_batt_temp(bm);
+ if (k >= 0)
+ count = snprintf(buf, PAGE_SIZE, "%d\n", k);
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(battery_temp, S_IRUGO,
+ n810bm_attr_battery_temp_show, NULL);
+
+static ssize_t n810bm_attr_charger_voltage_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count = -ENODEV;
+ int mv = 0;
+
+ mutex_lock(&bm->mutex);
+ if (bm->charger_present)
+ mv = n810bm_measure_charger_voltage(bm);
+ if (mv >= 0)
+ count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(charger_voltage, S_IRUGO,
+ n810bm_attr_charger_voltage_show, NULL);
+
+static ssize_t n810bm_attr_backup_battery_voltage_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count = -ENODEV;
+ int mv;
+
+ mutex_lock(&bm->mutex);
+ mv = n810bm_measure_backup_batt_voltage(bm);
+ if (mv >= 0)
+ count = snprintf(buf, PAGE_SIZE, "%d\n", mv);
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(backup_battery_voltage, S_IRUGO,
+ n810bm_attr_backup_battery_voltage_show, NULL);
+
+static ssize_t n810bm_attr_battery_current_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct n810bm *bm = device_to_n810bm(dev);
+ ssize_t count = -ENODEV;
+ int ma = 0;
+
+ mutex_lock(&bm->mutex);
+ if (bm->battery_present)
+ ma = n810bm_measure_batt_current_async(bm);
+ count = snprintf(buf, PAGE_SIZE, "%d\n", ma);
+ mutex_unlock(&bm->mutex);
+
+ return count;
+}
+static DEVICE_ATTR(battery_current, S_IRUGO,
+ n810bm_attr_battery_current_show, NULL);
+
+static const struct device_attribute *n810bm_attrs[] = {
+ &dev_attr_battery_present,
+ &dev_attr_battery_level,
+ &dev_attr_battery_charging,
+ &dev_attr_battery_current,
+ &dev_attr_battery_capacity,
+ &dev_attr_battery_temp,
+ &dev_attr_backup_battery_voltage,
+ &dev_attr_charger_present,
+ &dev_attr_charger_verbose,
+ &dev_attr_charger_voltage,
+ &dev_attr_charger_enable,
+ &dev_attr_charger_pwm,
+};
+
+static void n810bm_notify_work(struct work_struct *work)
+{
+ struct n810bm *bm = container_of(work, struct n810bm, notify_work);
+ unsigned long notify_flags;
+
+ notify_flags = xchg(&bm->notify_flags, 0);
+ mb();
+
+#define do_notify(attr_name) \
+ do { \
+ if (notify_flags & (1 << N810BM_NOTIFY_##attr_name)) { \
+ sysfs_notify(&bm->pdev->dev.kobj, NULL, \
+ dev_attr_##attr_name.attr.name); \
+ } \
+ } while (0)
+
+ do_notify(battery_charging);
+ do_notify(charger_pwm);
+}
+
+static int n810bm_charger_set_current_pwm(struct lipocharge *c,
+ unsigned int duty_cycle)
+{
+ struct n810bm *bm = container_of(c, struct n810bm, charger);
+ int err = -EINVAL;
+
+ WARN_ON(!mutex_is_locked(&bm->mutex));
+ if (WARN_ON(duty_cycle > 0xFF))
+ goto out;
+ if (WARN_ON(!bm->charger_enabled))
+ goto out;
+ if (WARN_ON(!bm->battery_present || !bm->charger_present))
+ goto out;
+
+ if (duty_cycle != bm->active_current_pwm) {
+ bm->active_current_pwm = duty_cycle;
+ tahvo_write(bm, TAHVO_REG_CHGCURR, duty_cycle);
+ n810bm_notify_charger_pwm(bm);
+ }
+
+ err = 0;
+out:
+
+ return err;
+}
+
+static void n810bm_charger_emergency(struct lipocharge *c)
+{
+ struct n810bm *bm = container_of(c, struct n810bm, charger);
+
+ n810bm_emergency(bm, "Battery charger fault");
+}
+
+static void n810bm_hw_exit(struct n810bm *bm)
+{
+ n810bm_stop_charge(bm);
+ retu_write(bm, RETU_REG_ADCSCR, 0);
+}
+
+static int n810bm_hw_init(struct n810bm *bm)
+{
+ int err;
+
+ err = n810bm_check_adc_sanity(bm);
+ if (err)
+ return err;
+
+ n810bm_stop_charge(bm);
+
+ return 0;
+}
+
+static void n810bm_cancel_and_flush_work(struct n810bm *bm)
+{
+ cancel_delayed_work_sync(&bm->periodic_check_work);
+ cancel_work_sync(&bm->notify_work);
+ cancel_work_sync(&bm->currmeas_irq_work);
+ flush_scheduled_work();
+}
+
+static int n810bm_device_init(struct n810bm *bm)
+{
+ int attr_index;
+ int err;
+
+ bm->charger.rate = LIPORATE_p6C;
+ bm->charger.top_voltage = 4100;
+ bm->charger.duty_cycle_max = 0xFF;
+ bm->charger.set_current_pwm = n810bm_charger_set_current_pwm;
+ bm->charger.emergency = n810bm_charger_emergency;
+ lipocharge_init(&bm->charger, &bm->pdev->dev);
+
+ err = n810bm_hw_init(bm);
+ if (err)
+ goto error;
+ for (attr_index = 0; attr_index < ARRAY_SIZE(n810bm_attrs); attr_index++) {
+ err = device_create_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
+ if (err)
+ goto err_unwind_attrs;
+ }
+ err = retu_request_irq(RETU_INT_ADCS,
+ n810bm_adc_irq_handler,
+ (unsigned long)bm, "n810bm");
+ if (err)
+ goto err_unwind_attrs;
+ err = tahvo_request_irq(TAHVO_INT_BATCURR,
+ n810bm_tahvo_current_measure_irq_handler,
+ (unsigned long)bm, "n810bm");
+ if (err)
+ goto err_free_retu_irq;
+ tahvo_disable_irq(TAHVO_INT_BATCURR);
+
+ schedule_delayed_work(&bm->periodic_check_work,
+ round_jiffies_relative(N810BM_CHECK_INTERVAL));
+
+ bm->initialized = 1;
+ dev_info(&bm->pdev->dev, "Battery management initialized");
+
+ return 0;
+
+err_free_retu_irq:
+ retu_free_irq(RETU_INT_ADCS);
+err_unwind_attrs:
+ for (attr_index--; attr_index >= 0; attr_index--)
+ device_remove_file(&bm->pdev->dev, n810bm_attrs[attr_index]);
+/*err_exit:*/
+ n810bm_hw_exit(bm);
+error:
+ n810bm_cancel_and_flush_work(bm);
+
+ return err;
+}
+
+static void n810bm_device_exit(struct n810bm *bm)
+{
+ int i;
+
+ if (!bm->initialized)
+ return;
+
+ lipocharge_exit(&bm->charger);
+ tahvo_free_irq(TAHVO_INT_BATCURR);
+ retu_free_irq(RETU_INT_ADCS);
+ for (i = 0; i < ARRAY_SIZE(n810bm_attrs); i++)
+ device_remove_file(&bm->pdev->dev, n810bm_attrs[i]);
+
+ n810bm_cancel_and_flush_work(bm);
+
+ n810bm_hw_exit(bm);
+ release_firmware(bm->pmm_block);
+
+ bm->initialized = 0;
+}
+
+static void n810bm_pmm_block_found(const struct firmware *fw, void *context)
+{
+ struct n810bm *bm = context;
+ int err;
+
+ if (!fw) {
+ dev_err(&bm->pdev->dev,
+ "CAL PMM block image file not found");
+ goto error;
+ }
+ if (fw->size != N810BM_PMM_BLOCK_SIZE ||
+ memcmp(fw->data, "BME-PMM-BLOCK01", 15) != 0) {
+ dev_err(&bm->pdev->dev,
+ "CAL PMM block image file has an invalid format");
+ goto error;
+ }
+
+ bm->pmm_block = fw;
+ err = n810bm_device_init(bm);
+ if (err) {
+ dev_err(&bm->pdev->dev,
+ "Failed to initialized battery management (%d)", err);
+ goto error;
+ }
+
+ return;
+error:
+ release_firmware(fw);
+}
+
+static int __devinit n810bm_probe(struct platform_device *pdev)
+{
+ struct n810bm *bm;
+ int err;
+
+ bm = kzalloc(sizeof(*bm), GFP_KERNEL);
+ if (!bm)
+ return -ENOMEM;
+ bm->pdev = pdev;
+ platform_set_drvdata(pdev, bm);
+ mutex_init(&bm->mutex);
+ INIT_DELAYED_WORK(&bm->periodic_check_work, n810bm_periodic_check_work);
+ INIT_WORK(&bm->notify_work, n810bm_notify_work);
+ INIT_WORK(&bm->currmeas_irq_work, n810bm_tahvo_current_measure_work);
+
+ dev_info(&bm->pdev->dev, "Requesting CAL BME PMM block firmware file "
+ N810BM_PMM_BLOCK_FILENAME);
+ err = request_firmware_nowait(THIS_MODULE, 1,
+ N810BM_PMM_BLOCK_FILENAME,
+ &bm->pdev->dev, GFP_KERNEL,
+ bm, n810bm_pmm_block_found);
+ if (err) {
+ dev_err(&bm->pdev->dev,
+ "Failed to request CAL PMM block image file (%d)", err);
+ goto err_free;
+ }
+
+ return 0;
+
+err_free:
+ kfree(bm);
+
+ return err;
+}
+
+static int __devexit n810bm_remove(struct platform_device *pdev)
+{
+ struct n810bm *bm = platform_get_drvdata(pdev);
+
+ n810bm_device_exit(bm);
+
+ kfree(bm);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver n810bm_driver = {
+ .remove = __devexit_p(n810bm_remove),
+ .driver = {
+ .name = "n810bm",
+ }
+};
+
+static int __init n810bm_modinit(void)
+{
+ return platform_driver_probe(&n810bm_driver, n810bm_probe);
+}
+module_init(n810bm_modinit);
+
+static void __exit n810bm_modexit(void)
+{
+ platform_driver_unregister(&n810bm_driver);
+}
+module_exit(n810bm_modexit);
+
+MODULE_DESCRIPTION("Nokia n810 battery management");
+MODULE_FIRMWARE(N810BM_PMM_BLOCK_FILENAME);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Buesch");
Index: linux-2.6.37/drivers/cbus/retu.c
===================================================================
--- linux-2.6.37.orig/drivers/cbus/retu.c 2011-02-06 14:05:49.829387442 +0100
+++ linux-2.6.37/drivers/cbus/retu.c 2011-02-08 17:33:18.981369017 +0100
@@ -85,10 +85,10 @@
*
* This function writes a value to the specified register
*/
-void retu_write_reg(int reg, u16 val)
+int retu_write_reg(int reg, u16 val)
{
BUG_ON(!retu_initialized);
- cbus_write_reg(cbus_host, RETU_ID, reg, val);
+ return cbus_write_reg(cbus_host, RETU_ID, reg, val);
}
void retu_set_clear_reg_bits(int reg, u16 set, u16 clear)
@@ -459,6 +459,7 @@
EXPORT_SYMBOL(retu_ack_irq);
EXPORT_SYMBOL(retu_read_reg);
EXPORT_SYMBOL(retu_write_reg);
+EXPORT_SYMBOL(retu_read_adc);
subsys_initcall(retu_init);
module_exit(retu_exit);
Index: linux-2.6.37/drivers/cbus/retu.h
===================================================================
--- linux-2.6.37.orig/drivers/cbus/retu.h 2011-02-06 14:05:49.829387442 +0100
+++ linux-2.6.37/drivers/cbus/retu.h 2011-02-06 14:05:49.886395793 +0100
@@ -40,6 +40,8 @@
#define RETU_REG_CTRL_CLR 0x0f /* Regulator clear register */
#define RETU_REG_CTRL_SET 0x10 /* Regulator set register */
#define RETU_REG_STATUS 0x16 /* Status register */
+#define RETU_REG_STATUS_BATAVAIL 0x0100 /* Battery available */
+#define RETU_REG_STATUS_CHGPLUG 0x1000 /* Charger is plugged in */
#define RETU_REG_WATCHDOG 0x17 /* Watchdog register */
#define RETU_REG_AUDTXR 0x18 /* Audio Codec Tx register */
#define RETU_REG_MAX 0x1f
@@ -57,8 +59,25 @@
#define MAX_RETU_IRQ_HANDLERS 16
+/* ADC channels */
+#define RETU_ADC_GND 0x00 /* Ground */
+#define RETU_ADC_BSI 0x01 /* Battery Size Indicator */
+#define RETU_ADC_BATTEMP 0x02 /* Battery temperature */
+#define RETU_ADC_CHGVOLT 0x03 /* Charger voltage */
+#define RETU_ADC_HEADSET 0x04 /* Headset detection */
+#define RETU_ADC_HOOKDET 0x05 /* Hook detection */
+#define RETU_ADC_RFGP 0x06 /* RF GP */
+#define RETU_ADC_WBTX 0x07 /* Wideband Tx detection */
+#define RETU_ADC_BATTVOLT 0x08 /* Battery voltage measurement */
+#define RETU_ADC_GND2 0x09 /* Ground */
+#define RETU_ADC_LIGHTSENS 0x0A /* Light sensor */
+#define RETU_ADC_LIGHTTEMP 0x0B /* Light sensor temperature */
+#define RETU_ADC_BKUPVOLT 0x0C /* Backup battery voltage */
+#define RETU_ADC_TEMP 0x0D /* RETU temperature */
+
+
int retu_read_reg(int reg);
-void retu_write_reg(int reg, u16 val);
+int retu_write_reg(int reg, u16 val);
void retu_set_clear_reg_bits(int reg, u16 set, u16 clear);
int retu_read_adc(int channel);
int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
Index: linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c
===================================================================
--- linux-2.6.37.orig/arch/arm/mach-omap2/board-n8x0.c 2011-02-06 14:05:49.815385390 +0100
+++ linux-2.6.37/arch/arm/mach-omap2/board-n8x0.c 2011-02-06 14:05:49.886395793 +0100
@@ -907,6 +907,17 @@
ARRAY_SIZE(n8x0_gpio_switches));
}
+static struct platform_device n810_bm_device = {
+ .name = "n810bm",
+ .id = -1,
+};
+
+static void __init n810_bm_init(void)
+{
+ if (platform_device_register(&n810_bm_device))
+ BUG();
+}
+
static void __init n8x0_init_machine(void)
{
omap2420_mux_init(board_mux, OMAP_PACKAGE_ZAC);
@@ -933,6 +944,8 @@
n8x0_onenand_init();
n8x0_mmc_init();
n8x0_usb_init();
+
+ n810_bm_init();
}
MACHINE_START(NOKIA_N800, "Nokia N800")
Index: linux-2.6.37/drivers/cbus/lipocharge.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/lipocharge.c 2011-02-09 12:42:58.243147563 +0100
@@ -0,0 +1,183 @@
+/*
+ * Generic LIPO battery charger
+ *
+ * Copyright (c) 2010-2011 Michael Buesch <mb@bu3sch.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define DEBUG
+
+#include "lipocharge.h"
+
+#include <linux/slab.h>
+
+
+/* Hysteresis constants */
+#define CURRENT_HYST 30 /* mA */
+#define VOLTAGE_HYST 10 /* mV */
+
+/* Threshold constants */
+#define FINISH_CURRENT_PERCENT 3
+
+
+/* Returns the requested first-stage charge current in mA */
+static inline unsigned int get_stage1_charge_current(struct lipocharge *c)
+{
+ /* current = (capacity * C) */
+ return c->capacity * c->rate / 1000;
+}
+
+void lipocharge_init(struct lipocharge *c, struct device *dev)
+{
+ c->dev = dev;
+ c->state = LIPO_IDLE;
+}
+
+void lipocharge_exit(struct lipocharge *c)
+{
+ c->state = LIPO_IDLE;
+}
+
+int lipocharge_start(struct lipocharge *c)
+{
+ int err;
+
+ if (c->state != LIPO_IDLE)
+ return -EBUSY;
+ if (!c->set_current_pwm || !c->emergency)
+ return -EINVAL;
+ if (!c->top_voltage || c->top_voltage > 4200)
+ return -EINVAL;
+
+ c->active_duty_cycle = 0;
+ err = c->set_current_pwm(c, c->active_duty_cycle);
+ if (err)
+ return err;
+ c->state = LIPO_FIRST_STAGE;
+
+ return 0;
+}
+
+void lipocharge_stop(struct lipocharge *c)
+{
+ if (c->state == LIPO_IDLE)
+ return;
+ c->state = LIPO_IDLE;
+}
+
+static int lipocharge_increase_current(struct lipocharge *c,
+ unsigned int inc_permille)
+{
+ int old_pwm, new_pwm;
+
+ if (c->active_duty_cycle >= c->duty_cycle_max)
+ return 0;
+
+ old_pwm = c->active_duty_cycle;
+ new_pwm = old_pwm + (c->duty_cycle_max * inc_permille / 1000);
+ new_pwm = min(new_pwm, (int)c->duty_cycle_max);
+ c->active_duty_cycle = new_pwm;
+
+ dev_dbg(c->dev, "lipo: Increasing duty_cycle by "
+ "%u permille (0x%02X -> 0x%02X)",
+ inc_permille, old_pwm, new_pwm);
+
+ return c->set_current_pwm(c, c->active_duty_cycle);
+}
+
+static int lipocharge_decrease_current(struct lipocharge *c,
+ unsigned int dec_permille)
+{
+ int old_pwm, new_pwm;
+
+ if (c->active_duty_cycle <= 0)
+ return 0;
+
+ old_pwm = c->active_duty_cycle;
+ new_pwm = old_pwm - (c->duty_cycle_max * dec_permille / 1000);
+ new_pwm = max(0, new_pwm);
+ c->active_duty_cycle = new_pwm;
+
+ dev_dbg(c->dev, "lipo: Decreasing duty_cycle by "
+ "%u permille (0x%02X -> 0x%02X)",
+ dec_permille, old_pwm, new_pwm);
+
+ return c->set_current_pwm(c, c->active_duty_cycle);
+}
+
+/** lipocharge_update_state - Update the charge state
+ * @c: The context.
+ * @voltage_mV: The measured battery voltage.
+ * @current_mA: The measured charge current.
+ * negative -> drain.
+ * positive -> charge.
+ * @temp_K: Battery temperature in K.
+ *
+ * Returns 0 on success, -1 on error.
+ * Returns 1, if the charging process is finished.
+ */
+int lipocharge_update_state(struct lipocharge *c,
+ unsigned int voltage_mV,
+ int current_mA,
+ unsigned int temp_K)
+{
+ int requested_current, current_diff;
+ int err;
+ unsigned int permille;
+
+ //TODO temp
+
+restart:
+ switch (c->state) {
+ case LIPO_IDLE:
+ dev_err(c->dev, "%s: called while idle", __func__);
+ return -EINVAL;
+ case LIPO_FIRST_STAGE: /* Constant current */
+//printk("GOT %u %d %u\n", voltage_mV, current_mA, temp_K);
+ if (voltage_mV >= c->top_voltage) {
+ /* Float voltage reached.
+ * Switch charger mode to "constant current" */
+ c->state = LIPO_SECOND_STAGE;
+ dev_dbg(c->dev, "Switched to second charging stage.");
+ goto restart;
+ }
+ /* Float voltage not reached, yet.
+ * Try to get the requested constant current. */
+ requested_current = get_stage1_charge_current(c);
+ if (current_mA < 0)
+ current_mA = 0;
+ current_diff = requested_current - current_mA;
+ if (abs(requested_current - current_mA) > CURRENT_HYST) {
+ if (current_diff > 0) {
+ /* Increase current */
+ permille = current_diff * 1000 / requested_current;
+ permille /= 2;
+ err = lipocharge_increase_current(c, permille);
+ if (err)
+ return err;
+ } else {
+ /* Decrease current */
+ permille = (-current_diff) * 1000 / requested_current;
+ permille /= 2;
+ err = lipocharge_decrease_current(c, permille);
+ if (err)
+ return err;
+ }
+ }
+ break;
+ case LIPO_SECOND_STAGE: /* Constant voltage */
+ //TODO
+ break;
+ }
+
+ return 0;
+}
Index: linux-2.6.37/drivers/cbus/lipocharge.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/lipocharge.h 2011-02-07 20:07:29.669098631 +0100
@@ -0,0 +1,60 @@
+#ifndef LIPOCHARGE_H_
+#define LIPOCHARGE_H_
+
+#include <linux/types.h>
+#include <linux/device.h>
+
+
+#define LIPORATE(a,b) (((a) * 1000) + ((b) * 100))
+#define LIPORATE_p6C LIPORATE(0,6) /* 0.6C */
+
+enum lipocharge_state {
+ LIPO_IDLE, /* Not charging */
+ LIPO_FIRST_STAGE, /* Charging: constant current */
+ LIPO_SECOND_STAGE, /* Charging: constant voltage */
+};
+
+/** struct lipocharge - A generic LIPO charger
+ *
+ * @capacity: Battery capacity in mAh.
+ * @rate: Charge rate.
+ * @top_voltage: Fully charged voltage, in mV.
+ * @duty_cycle_max: Max value for duty_cycle.
+ *
+ * @set_charge_current: Set the charge current PWM duty cycle.
+ * @emergency: Something went wrong. Force shutdown.
+ */
+struct lipocharge {
+ unsigned int capacity;
+ unsigned int rate;
+ unsigned int top_voltage;
+ unsigned int duty_cycle_max;
+
+ int (*set_current_pwm)(struct lipocharge *c, unsigned int duty_cycle);
+ void (*emergency)(struct lipocharge *c);
+
+ /* internal */
+ struct device *dev;
+ enum lipocharge_state state;
+ unsigned int active_duty_cycle;
+
+ //TODO implement timer to cut power after maximum charge time.
+};
+
+void lipocharge_init(struct lipocharge *c, struct device *dev);
+void lipocharge_exit(struct lipocharge *c);
+
+int lipocharge_start(struct lipocharge *c);
+void lipocharge_stop(struct lipocharge *c);
+
+int lipocharge_update_state(struct lipocharge *c,
+ unsigned int voltage_mV,
+ int current_mA,
+ unsigned int temp_K);
+
+static inline bool lipocharge_is_charging(struct lipocharge *c)
+{
+ return (c->state != LIPO_IDLE);
+}
+
+#endif /* LIPOCHARGE_H_ */
Index: linux-2.6.37/drivers/cbus/tahvo.h
===================================================================
--- linux-2.6.37.orig/drivers/cbus/tahvo.h 2011-02-06 14:05:49.830387588 +0100
+++ linux-2.6.37/drivers/cbus/tahvo.h 2011-02-06 16:22:25.902331536 +0100
@@ -30,17 +30,28 @@
#define TAHVO_REG_IDR 0x01 /* Interrupt ID */
#define TAHVO_REG_IDSR 0x02 /* Interrupt status */
#define TAHVO_REG_IMR 0x03 /* Interrupt mask */
+#define TAHVO_REG_CHGCURR 0x04 /* Charge current control PWM (8-bit) */
#define TAHVO_REG_LEDPWMR 0x05 /* LED PWM */
#define TAHVO_REG_USBR 0x06 /* USB control */
+#define TAHVO_REG_CHGCTL 0x08 /* Charge control register */
+#define TAHVO_REG_CHGCTL_EN 0x0001 /* Global charge enable */
+#define TAHVO_REG_CHGCTL_PWMOVR 0x0004 /* PWM override. Force charge PWM to 0%/100% duty cycle. */
+#define TAHVO_REG_CHGCTL_PWMOVRZERO 0x0008 /* If set, PWM override is 0% (If unset -> 100%) */
+#define TAHVO_REG_CHGCTL_CURMEAS 0x0040 /* Enable battery current measurement. */
+#define TAHVO_REG_CHGCTL_CURTIMRST 0x0080 /* Current measure timer reset. */
+#define TAHVO_REG_BATCURRTIMER 0x0c /* Battery current measure timer (8-bit) */
+#define TAHVO_REG_BATCURR 0x0d /* Battery (dis)charge current (signed 16-bit) */
+
#define TAHVO_REG_MAX 0x0d
/* Interrupt sources */
#define TAHVO_INT_VBUSON 0
+#define TAHVO_INT_BATCURR 7 /* Battery current measure timer */
#define MAX_TAHVO_IRQ_HANDLERS 8
int tahvo_read_reg(int reg);
-void tahvo_write_reg(int reg, u16 val);
+int tahvo_write_reg(int reg, u16 val);
void tahvo_set_clear_reg_bits(int reg, u16 set, u16 clear);
int tahvo_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
void tahvo_free_irq(int id);
Index: linux-2.6.37/drivers/cbus/tahvo.c
===================================================================
--- linux-2.6.37.orig/drivers/cbus/tahvo.c 2011-02-06 14:05:49.830387588 +0100
+++ linux-2.6.37/drivers/cbus/tahvo.c 2011-02-06 14:05:49.886395793 +0100
@@ -85,10 +85,10 @@
*
* This function writes a value to the specified register
*/
-void tahvo_write_reg(int reg, u16 val)
+int tahvo_write_reg(int reg, u16 val)
{
BUG_ON(!tahvo_initialized);
- cbus_write_reg(cbus_host, TAHVO_ID, reg, val);
+ return cbus_write_reg(cbus_host, TAHVO_ID, reg, val);
}
/**
Index: linux-2.6.37/drivers/cbus/cbus.c
===================================================================
--- linux-2.6.37.orig/drivers/cbus/cbus.c 2011-02-08 17:34:34.988926130 +0100
+++ linux-2.6.37/drivers/cbus/cbus.c 2011-02-08 17:38:16.980407594 +0100
@@ -31,6 +31,7 @@
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/reboot.h>
#include <asm/io.h>
#include <asm/mach-types.h>
@@ -301,6 +302,13 @@
}
module_exit(cbus_bus_exit);
+void cbus_emergency(void)
+{
+ machine_power_off();
+ panic("cbus: Failed to halt machine in emergency state\n");
+}
+EXPORT_SYMBOL(cbus_emergency);
+
MODULE_DESCRIPTION("CBUS serial protocol");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Juha Yrj<72>l<EFBFBD>");
Index: linux-2.6.37/drivers/cbus/cbus.h
===================================================================
--- linux-2.6.37.orig/drivers/cbus/cbus.h 2011-02-08 17:36:40.172074049 +0100
+++ linux-2.6.37/drivers/cbus/cbus.h 2011-02-08 17:41:32.680647478 +0100
@@ -33,4 +33,6 @@
extern int cbus_read_reg(struct cbus_host *host, int dev, int reg);
extern int cbus_write_reg(struct cbus_host *host, int dev, int reg, u16 val);
+NORET_TYPE void cbus_emergency(void) ATTRIB_NORET;
+
#endif /* __DRIVERS_CBUS_CBUS_H */
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